Research On Real-Time Monitoring And Fault Diagnosis Expert System For Excitation Systems

As the core of the generator control system, excitation equipment plays an important role in maintaining the safe and steady operation of generators and power systems. To improve operation and maintenance, a real-time monitoring system and an expert system for fault diagnosis of excitation system were discussed in this paper.First, a real-time monitoring module of excitation system was discussed, including the hardware architecture and the design ideas and realization methods of the software module.There are a lot of parameters to be monitored and recorded in the excitation system, In order to process these data without increasing the hardware, a real-time monitoring system for excitation based on CAN bus was proposed. The modules of excitation system are connected with each other by CAN bus, so the monitoring system can receive all the operation and control data, and the data quantity can be modified by the software. LabVIEW was used for the design of the monitoring system software .The software system is composed of real-time display module, parameter configuration module, event sequence record module and fault data record module. The monitoring system has the characters of friendly interface, rich function, easy maintenance and easy upgrading. This monitoring module has been applied to a new type of excitation system. The excitation fault diagnosis expert system can make fast troubleshooting and shorter outage of generator. By analyzing the fault cause of the excitation system and combining the practical experience of the on-site maintenance personnel and excitation field experts, the knowledge base and the maintenance system of the excitation fault diagnosis expert system were established in this paper.In order to fast troubleshooting, shorten reasoning time, the dynamic priority search strategy was proposed in this paper. The expert system for fault diagnosis of excitation program was based on LabVIEW and the ESTA shell of Prolog. As far as the excitation system fault is concerned, the expert system realized the Human-Machine Interaction. According to different malfunction to the idiographic malfunction, this expert system could offer corresponding Treatment suggestion and system fault reason interpretation. It is helpful for the site personnel to solve, in a fast way, the excitation system problem.